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针对光学头罩热辐射干扰饱和问题,应用有限元法模拟了飞行高度为15 km,马赫数Ma=4时不镀膜CVD Zn S光学头罩和表面镀上1 300 nm Hf O2的CVD Zn S的光学头罩的温度场分布情况。根据光学头罩的温度场分布,仿真得到头罩干扰辐射强度的分布,从而对光学头罩的气动热辐射效应进行评估。模拟结果表明,不镀膜和镀膜CVD Zn S光学头罩的温度值相差不大,但是Hf O2薄膜对CVD Zn S光学头罩的热辐射干扰饱和产生明显的延迟,提高了光学头罩抗热辐射效应的能力。
Aiming at the problem of thermal radiation interference saturation of optical hood, the finite element method was used to simulate the CVD Zn S with uncoated CVD Zn S optical hood and the surface coated with 1300 nm Hf O2 at a flying height of 15 km with Ma = 4 Optical hood temperature distribution. According to the temperature field distribution of the optical head cover, the distribution of the interference radiation intensity of the head cover is simulated to evaluate the aerodynamic heat radiation effect of the optical head cover. The simulation results show that the temperature difference between uncoated and coated CVD ZnS optical head covers is similar, but the Hf O2 thin film has a significant delay to the heat radiation interference of the CVD Zn S optical cover and thus improves the thermal resistance of the optical cover Effect of the ability.